When visiting the menu and trying to click on sublinks by hovering over before clicking, the sublinks flicker and disappear which would be inconvenient to most users so the only way to access these pages is by clicking the respective general page link (Web Exclusives) in the menu.

How can I prevent the sublinks from disappearing?

I have done numerous searches but have not found an answer.
I can modify php templates or css stylesheets with instruction.
Denzel had suggested deactivating plugins one by one for the Evolve Demo mode. Are there any other solutions for Evolve Plus?